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Feed Production Machinery


ALBANY MOLASSES AND FATS


PUMPS Albany long life molasses pumps can be used on blackstrap and on low viscosity blends of molasses. Low speed, high torque designs handle a wide range of viscosities. Our FF nylon cased 2” pump gives good results on acidic molasses. Capacities from 1 to 250 litres/min are provided for from a number of iron and nylon models. For fats pumping Albany use heated ni-resist cased pumps which


due to high nickel content and hardness give excellent life. These ceramic sealed pumps handle all vegetable and acid palm oils. Our FF nylon cased pump delivers up to 150 l/min and is a low cost unheated option which is hygienic and very acid resistant. Albany’s FF pumps are available from – Charlie Stevenson on telephone no. 07990 521 793 The Albany Engineering Co Ltd Church Road, Lydney, GLOS GL15 5EQ Tel: +44 (0) 1594 842275


Fax: +44 (0) 1594 842574


e-mail: sales@albany-pumps.co.uk www.albany-pumps.co.uk


A rotating cutter was designed, meant to cut the product strands


leaving the die to uniform pellet lengths. So the ‘Crown Expander’ was born. The machine owes its name to the crown form of the first dies which were provided with slits instead of bores. One important component of the annular gap expander remained


THE CROWN EXPANDER: PELLETING


WITHOUT A PELLETING PRESS Our customers operate more than 600 expanders worldwide. In the U.S.A. for example, turkey fattening feed is expanded before pelleting in most cases. The annular gap expander has proved to be a good solution also in other fields such as starch modification or the oilseeds- processing industry. And last but not least, we have developed our Kahl extruder on


the basis of the expander. With the extruder even higher mechanical energy inputs and modification degrees can be realised, and the products – fish feed, petfood, and snacks – can be pelleted or given other defined shapes. For quite some time, there has been a clear


PAGE 32 MARCH 2011 FEED COMPOUNDER


unchanged in the Crown expander: The hydraulically moveable cone. This cone can be moved into and out of the crown die at the outlet end. Depending on the position of the cone in the die, more or less die bores are open for the production of pellets. Thus the pelleting process is easy to control by simply varying the cone position – in contrast to conventional extrusion processes which require die changes or far more complicated control mechanisms. The results obtained so far, have met every expectation, which


means that we succeeded in the proverbial ‘squaring of the circle’: The Crown expander produces pellets or other regularly shaped structures while preserving coarse particles and simultaneously agglomerating fine and finest components. The positive nutritional effect of expansion is an additional advantage which traditional pelleting does not offer. The crown expander – an ideal example of a successful further


development taking into account aspects of animal nutrition and process technology. Contact: www. akahl.de


tendency towards coarse grinding of feed. Amandus Kahl remembered that in the annular gap expander,


coarse grinding structures remain largely unchanged, although the product is exposed to a strong pressure and kneading effect. The pressure load in the expander acts on all sides of the coarse


particles. The homogeneous pressure distribution on the entire particle circumference is supported by embedding these coarse particles in a pasty moist matrix of fine particles. Another advantage lies in the fact that the finer particles are


agglomerated during expansion and thus are transformed into coarse structures. It occurred to our engineers that they might equip the expander outlet with an annular die similar to that of a pelleting press. A die without pan grinder rollers to be more precise, as they wondered: Should the high internal pressure of the expander not be able to press the finished product right through the round or oblong bores in the die ring, thus making the pressing and crushing effect of pan grinder rollers superfluous?


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